1 /*
2 * A 32-bit implementation of the XTEA algorithm
3 * Copyright (c) 2012 Samuel Pitoiset
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #ifndef AVUTIL_XTEA_H
23 #define AVUTIL_XTEA_H
24
25 #include <stdint.h>
26
27 /**
28 * @file
29 * @brief Public header for libavutil XTEA algorithm
30 * @defgroup lavu_xtea XTEA
31 * @ingroup lavu_crypto
32 * @{
33 */
34
38
39 /**
40 * Allocate an AVXTEA context.
41 */
43
44 /**
45 * Initialize an AVXTEA context.
46 *
47 * @param ctx an AVXTEA context
48 * @param key a key of 16 bytes used for encryption/decryption,
49 * interpreted as big endian 32 bit numbers
50 */
52
53 /**
54 * Initialize an AVXTEA context.
55 *
56 * @param ctx an AVXTEA context
57 * @param key a key of 16 bytes used for encryption/decryption,
58 * interpreted as little endian 32 bit numbers
59 */
61
62 /**
63 * Encrypt or decrypt a buffer using a previously initialized context,
64 * in big endian format.
65 *
66 * @param ctx an AVXTEA context
67 * @param dst destination array, can be equal to src
68 * @param src source array, can be equal to dst
69 * @param count number of 8 byte blocks
70 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
71 * @param decrypt 0 for encryption, 1 for decryption
72 */
74 int count, uint8_t *iv, int decrypt);
75
76 /**
77 * Encrypt or decrypt a buffer using a previously initialized context,
78 * in little endian format.
79 *
80 * @param ctx an AVXTEA context
81 * @param dst destination array, can be equal to src
82 * @param src source array, can be equal to dst
83 * @param count number of 8 byte blocks
84 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
85 * @param decrypt 0 for encryption, 1 for decryption
86 */
88 int count, uint8_t *iv, int decrypt);
89
90 /**
91 * @}
92 */
93
94 #endif /* AVUTIL_XTEA_H */